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Allowance for Loan Losses - Impaired Loans - Average Recorded Investment and Interest Income Recognized (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | $ 3,595 | $ 6,382
Interest Income Recognized | 41 | 50
Commercial and Agriculture [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 732 | 1,852
Interest Income Recognized | 7 | 6
Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 771 | 1,886
Interest Income Recognized | 9 | 22
Commercial Real Estate Non Owner Occupied [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 43 | 358
Interest Income Recognized | 1 |
Residential Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 1,348 | 1,671
Interest Income Recognized | 17 | 16
Farm Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 701 | 614
Interest Income Recognized | $ 7 | 6
Consumer and Other [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment |  | $ 1

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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524 + Details
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- Definition Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
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